I may be wrong, because I am still studying this stuff, but I believe that
Per-VLAN STP is a Cisco critter...ISL....
Jason Fletcher
""Lance Hubbard"" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> This brings to mind a question for the group:
>
> Will Cisco's 802.1Q implementation support per-VLAN STP?
>
> Cheers,
>
> Lance
>
>
> >From: "Chris H" <[EMAIL PROTECTED]>
> >Reply-To: "Chris H" <[EMAIL PROTECTED]>
> >To: [EMAIL PROTECTED], [EMAIL PROTECTED]
> >Subject: Re: Cisco to 3Com Dot1Q trunks and VLANs
> >Date: Mon, 15 Jan 2001 19:41:55 -0000
> >
> >Michale,
> >
> >I have dot1q trunks running across Cisco MDF switches and Nortel IDF
> >switches. We found that Cisco and Nortel run two different versions of
> >Spanning Tree, both of which are 802.1q compliant. The difference
between
> >the two is that Cisco's portfast feature, and Nortel's faststart feature
> >are
> >different, where portfast has a default forward delay of 15 seconds, and
> >faststart doesn't implement the forward delay feature.
> >
> >This resulted in a huge amount of TCN's (topology change notifications),
> >particularly in the morning, when all end users are booting up their pc's
> >and changing to 'forwarding' mode in spanning tree. As a result, we
opened
> >a ticket with Nortel, and they agreed to add forward delay to their
> >switching code to correct this problem.
> >
> >I would check the STP documentation on both vendors, and determine if all
> >the default values are the same, what the default root bridge priority
> >number is with both vendors, who you have configured as your root bridge,
> >etc. I would even plug a sniffer in and capture some traffic... Draw out
a
> >spanning tree diagram, and document your root bridge, and the subsequent
> >switches in the spanning tree. Those are just some suggestions... Hope
you
> >find some results.
> >
> >Chris
> >
> >
> > >From: [EMAIL PROTECTED]
> > >Reply-To: [EMAIL PROTECTED]
> > >To: [EMAIL PROTECTED]
> > >Subject: Cisco to 3Com Dot1Q trunks and VLANs
> > >Date: Thu, 11 Jan 2001 13:02:56 -0600
> > >
> > >I have the opportunity to create this cross platform network and am
> >looking
> > >for
> > >information other than the standard documentation from Cisco and 3Com
to
> > >accomplish this task. The dot1Q trunks appear to be functioning
> >correctly
> > >between the Cisco 6509 and the 3Com 3300, but the VLANs are not
> >performing
> > >optimally. Any helpful information or pointers to sites with
information
> > >would
> > >be greatly appreciated.
> > >
> > >Mike
> > >
> > >
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